REV.-A
1.6.11 Protection during Heavy Duty Printing
This printer has a protection function to prevent the printhead from overheating and to stop printing
when the head driver voltage drops. If the temperature of the
printhead
exceeds the maximum allowed
value, printing stops automatically. When the
printhead temperature drops to a certain value, printing
resumes. At first, printing resumes at a lower print speed. However, as the
printhead temperature
decreases, print speed increases
to the normal speed. If the
printhead temperature continues to increase at the lower speed, the printer
stops printing. The printer stops or resumes printing as the
printhead
temperature increases or
decreases.
If the voltage supplied to the head drive circuit drops below its minimum limit as a result of heavy duty
printing, printing is interrupted immediately. When the power supply voltage increases to a certain
value, the remaining print line is printed at half speed. this protective action occurs when half or more
of the wires are activated continuously.
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